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One of Monitise's former shareholders has admitted that his "biggest regret" of last year was allowing the fallen UK tech darling to be sold to US suitor Fiserv for just £75m.

Cavendish fund manager Paul Mumford said last year that even though the mobile payments firm, once worth more than £1bn, was being "sold down the river" he would not try and block the takeover.

However Monitise's £36.5m sale of discount website MyVoucherCodes to price comparison site GoCompare in December has angered the investor, whose fund owned around 5pc of the firm. Monitise acquired MyVoucherCodes for £55m in 2014.

"As if this hugely discounted deal [with Fiserv] was not bad enough for investors, it turns out Monitise...